104 documents found, page 1 of 11
Bounding box-free instance segmentation using semi-supervised iterative learnin...
Carvalho, Osmar Luiz Ferreira de; Carvalho Júnior, Osmar Abílio de; Albuquerque, Anesmar Olino de; Santana, Nickolas Castro; Guimarães, Renato FontesVehicle classification is a hot computer vision topic, with studies ranging from ground-view to top-view imagery. Top-view images allow understanding city patterns, traffic management, among others. However, there are some difficulties for pixel-wise classification: most vehicle classification studies use object detection methods, and most publicly available datasets are designed for this task, creating instanc...
Assessment of gully development using geomorphic change detection between pre-a...
Albuquerque, Anesmar Olino de; Carvalho Júnior, Osmar Abílio de; Guimarães, Renato Fontes; Trancoso Gomes, Roberto Arnaldo; Hermuche, Potira MeirellesUrbanization processes have caused changes in the runoff behavior, especially by impervious surfaces produced by paving and buildings. Impermeable surfaces prevent the infiltration of rainwater, increasing the volume and speed of runoff. Besides, inadequate urban planning coupled with heavy rains promotes the evolution of erosion processes, especially in peri-urban areas. This research aims to identify spatial ...
Potencialidades e limitações do uso de informações altimétricas provenientes de...
Barbosa, Felipe Lima Ramos; Guimarães, Renato Fontes; Carvalho Júnior, Osmar Abílio de; Gomes, Roberto Arnaldo Trancoso; Lima, Erondina Azevedo deA concentração da população brasileira residindo em ambientes urbanos demandam uma gestão eficiente do território e dos efeitos provenientes do escoamento hídrico, tais como erosão, inundações e movimento de massa. O presente trabalho tem como objetivo adequar para áreas urbanas a delimitação de Áreas de Sensibilidade Hidrológicas (ASH), utilizando o Índice Topográfico de Umidade (ITU). A área de estudo é a Reg...
Change detection of deforestation in the Brazilian Amazon using landsat data an...
Bem, Pablo Pozzobon de; Carvalho Júnior, Osmar Abílio de; Guimarães, Renato Fontes; Gomes, Roberto Arnaldo TrancosoMapping deforestation is an essential step in the process of managing tropical rainforests. It lets us understand and monitor both legal and illegal deforestation and its implications, which include the effect deforestation may have on climate change through greenhouse gas emissions. Given that there is ample room for improvements when it comes to mapping deforestation using satellite imagery, in this study, we...
Management Control in Public Administration and Digital Transformation: Remote ...
Orlandi, Alex Gois; Farias, Renata de Araujo Nobre; Carvalho Júnior, Osmar Abílio; Guimarães, Renato Fontes; Gomes, Roberto Arnaldo TrancosoThis research aims to demonstrate how management control in Public Administration can apply remote sensing through free satellite images as a tool for digital transformation, generating savings and efficiency. The work is based on a pilot project under development at the National Electric Energy Agency for the inspection of the works of photovoltaic power generation plants under implementation. The results obta...
Rice crop detection using LSTM, Bi-LSTM, and machine learning models from senti...
Castro Filho, Hugo Crisóstomo de; Carvalho Júnior, Osmar Abílio de; Carvalho, Osmar Luiz Ferreira de; Bem, Pablo Pozzobon deThe Synthetic Aperture Radar (SAR) time series allows describing the rice phenological cycle by the backscattering time signature. Therefore, the advent of the Copernicus Sentinel-1 program expands studies of radar data (C-band) for rice monitoring at regional scales, due to the high temporal resolution and free data distribution. Recurrent Neural Network (RNN) model has reached state-of-the-art in the pattern ...
Remote sensing for monitoring photovoltaic solar plants in Brazil using deep se...
Costa, Marcus Vinícius Coelho Vieira da; Carvalho, Osmar Luiz Ferreira de; Orlandi, Alex Gois; Hirata, Issao; Albuquerque, Anesmar Olino deBrazil is a tropical country with continental dimensions and abundant solar resources that are still underutilized. However, solar energy is one of the most promising renewable sources in the country. The proper inspection of Photovoltaic (PV) solar plants is an issue of great interest for the Brazilian territory’s energy management agency, and advances in computer vision and deep learning allow automatic, peri...
Deep semantic segmentation of center pivot irrigation systems from remotely sen...
Albuquerque, Anesmar Olino de; Carvalho Júnior, Osmar Abílio de; Carvalho, Osmar Luiz Ferreira de; Bem, Pablo Pozzobon deThe center pivot irrigation system (CPIS) is a modern irrigation technique widely used in precision agriculture due to its high efficiency in water consumption and low labor compared to traditional irrigation methods. The CPIS is a leader in mechanized irrigation in Brazil, with growth forecast for the coming years. Therefore, the mapping of center pivot areas is a strategic factor for the estimation of agricul...
Classificação do uso e cobertura da terra utilizando imagens SAR/Sentinel 1 no ...
Barbosa, Felipe Lima Ramos; Guimarães, Renato Fontes; Carvalho Júnior, Osmar Abílio de; Gomes, Roberto Arnaldo TrancosoOs desafios sociais e ambientais estão diretamente relacionados à concentração populacional existente nos ambientes urbanos, que contribuem em mais de 75% do Produto Interno Bruto (PIB) mundial. Assim, é essencial a detecção da dinâmica do uso e cobertura da terra visando à elaboração e efetivação de políticas públicas. Os sistemas SAR, especialmente as técnicas de interferometria, vêm apresentando ótimos resul...
The spatiotemporal dynamics of soybean and cattle production in Brazil
Maranhão, Rebecca Lima Albuquerque; Carvalho Júnior, Osmar Abílio de; Hermuche, Potira Meirelles; Gomes, Roberto Arnaldo TrancosoThe expansion of agricultural frontiers in Brazil has caused substantial changes in land use and land cover. This research aims to analyze the space-time dynamics of soybeans and cattle production in the Brazilian territory during the period 1991–2015. The spatial analysis adopted the following procedures: (a) The change vector from the annual calculation of the midpoint of production; (b) mapping of the growth...